Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.272..599k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 272, Issue 3, pp. 599-604.
Astronomy and Astrophysics
Astronomy
35
Stars, Early-Type-Ism, Clouds-Ism, Individual, Hvc Complex M-Galaxy, Halo.
Scientific paper
High-resolution optical spectra of the early-type stars HD 93521 and BD +38 deg2182, which lie only 27 arcmin apart on the sky in the direction of the high-velocity cloud (HVC) Complex M, reveal the presence of weak HVC absorption in the Ca K line towards BD +38 deg2182, with a velocity of V_LSR=-96.0+/-1.5 km s^-1 and an equivalent width W_lambda=11+/-2 mA. However, the HVC is not detected either in the Na D line for BD +38 deg2182 or in the Ca K and Na D lines towards HD 93521. These observations, combined with revised stellar distance estimates, imply that the HVC is at a distance from the Galactic plane of 1.8<=z<=4.6 kpc. The Ca/H abundance in the HVC is found to be at least ~=2 per cent of the solar value, consistent with the material being returning condensations from a Galactic fountain flow.
Bates Brandon
Dufton Philip L.
Keenan Francis P.
Kemp Simon N.
Shaw C. R.
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